CN219924552U - Device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate - Google Patents
Device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate Download PDFInfo
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- CN219924552U CN219924552U CN202320680335.7U CN202320680335U CN219924552U CN 219924552 U CN219924552 U CN 219924552U CN 202320680335 U CN202320680335 U CN 202320680335U CN 219924552 U CN219924552 U CN 219924552U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 308
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 97
- 239000012141 concentrate Substances 0.000 title claims abstract description 90
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 46
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000001257 hydrogen Substances 0.000 title claims abstract description 33
- 238000006722 reduction reaction Methods 0.000 claims abstract description 107
- 239000007789 gas Substances 0.000 claims abstract description 88
- 239000010419 fine particle Substances 0.000 claims description 21
- 238000001465 metallisation Methods 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 239000011362 coarse particle Substances 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000007873 sieving Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 2
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 238000012216 screening Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000000889 atomisation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000009689 gas atomisation Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009692 water atomization Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model discloses a device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate, which comprises a flash reduction assembly and a fluidized bed assembly, wherein the flash reduction assembly comprises a flash reduction furnace, the flash reduction furnace is provided with a first chamber and a first discharge hole which are mutually communicated, and the first chamber is internally provided with the ultrapure iron concentrate and the H-enriched iron concentrate 2 The reducing gas, the ultrapure iron concentrate undergoes hydrogen radical flash reduction in the first chamber and produces spherical iron powder, and the fluidized bed component comprises a fluidized bed which is provided with a first communicated with each otherThe second chamber is internally provided with a second discharging hole which comprises CO and H 2 The spherical iron powder in the first cavity can enter the second cavity through the first discharge hole and carry out secondary fine reduction reaction with the reducing gas in the second cavity. The device for preparing the spherical iron powder by hydrogen-based flash reduction of the ultra-pure iron concentrate has the advantages of simple structure, less impurity and high purity of the produced iron powder, and can effectively reduce CO 2 And the environmental load is reduced.
Description
Technical Field
The utility model relates to the technical field of metallurgical engineering, in particular to a device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate.
Background
Powder metallurgy is a technique for obtaining various materials and products by using a mixture of metal powder and non-metal powder as a raw material, and through compression molding, sintering and subsequent treatment. The spherical iron powder is used as high-performance metal powder, is mainly applied to advanced technologies such as metal additive manufacturing, injection molding and the like, and has great significance especially in the field of additive manufacturing.
Currently, the production process of spherical iron powder mainly comprises a hydroxyl process and an atomization process. The hydroxyl process is to react C0 and iron under high pressure to obtain oily Fe (CO) 5, and to condense and collect the oily Fe (CO) 5 to decompose the oily Fe (CO) 5 to obtain iron powder, and the iron powder has the characteristics of good sphericity, single granularity distribution, low porosity, high purity and the like.
The atomization process is to generate high-pressure and high-speed fluid through an atomization nozzle, quickly impact the molten metal flow, crush the molten metal flow into very fine liquid drops and quickly condense the very fine liquid drops to obtain fine metal powder, and the common atomization medium is water or gas, and is correspondingly called water atomization and gas atomization. The metal fine powder prepared by water atomization has high yield and high cooling speed, but the powder has high oxygen content and irregular shape, and is usually flaky. The powder prepared by gas atomization has small granularity, high sphericity and low oxygen content. The spherical powder is produced by adopting an atomization process, and has the defect of high energy consumption and high requirement on a nozzle.
Patent 201810309406.6 discloses a preparation method of micron-sized spherical iron powder, which uses methane as a main reducer, and carries out rapid reduction at 1200-1600 ℃, and the spherical iron-carbon alloy powder is obtained after mineral powder is subjected to the processes of reduction, carburization, melting, solidification and the like in a reactor.
However, the above proposed method for preparing spherical iron powder has the disadvantages of complex production process, large equipment investment, high production cost, more impurities in the produced iron powder and low purity.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the utility model provides a device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate, which has simple structure, produces iron powder with few impurities and high purity, and can effectively reduce CO 2 And the environmental load is reduced.
The device for preparing spherical iron powder by hydrogen-based flash reduction of the ultra-pure iron concentrate comprises:
the flash reduction assembly comprises a flash reduction furnace, the flash reduction furnace is provided with a first chamber, a first discharge hole and a feed inlet, the first chamber is mutually communicated with the feed inlet and the first discharge hole, the first chamber is internally provided with ultrapure iron concentrate, reducing gas and oxygen-enriched air, and the reducing gas in the first chamber comprises H 2 The ultrapure iron concentrate undergoes hydrogen flash reduction reaction in the first chamber and pre-reduced spherical iron powder is produced;
the fluidized bed assembly comprises a fluidized bed, the fluidized bed is provided with a second cavity and a second discharge hole, the second cavity is communicated with the second discharge hole and the first discharge hole, reducing gas is arranged in the second cavity, pre-reduced spherical iron powder generated in the first cavity can enter the second cavity through the first discharge hole and is subjected to secondary fine reduction reaction with the reducing gas in the second cavity, high-metallization-rate spherical iron powder is generated, and the reducing gas in the second cavity comprises CO and H 2 。
The hydrogen-based flash of the ultra-pure iron concentrate in the embodiment of the utility modelDevice for preparing spherical iron powder by reduction, wherein ultrapure iron concentrate and reducing gas are subjected to reduction reaction in a first chamber to generate pre-reduced spherical iron powder, and the reducing gas in the first chamber is mainly H 2 The purity of the produced spherical iron powder is improved, the pre-reduced spherical iron powder enters a second chamber through a first discharge hole, and CO and H are mixed in the second chamber 2 The device for preparing the spherical iron powder by hydrogen-based flash reduction of the ultra-pure iron concentrate has simple structure, and the produced iron powder has few impurities and high purity and can effectively reduce CO 2 And the environmental load is reduced.
In some embodiments, the first chamber includes a preheating section, a reduction section and a cooling section sequentially arranged from top to bottom, the ultrapure iron concentrate sequentially passes through the preheating section, the reduction section and the cooling section, the temperature of the reduction section is 1380-1600 ℃, and the temperature of the cooling section is less than 1000 ℃.
In some embodiments, the flash reduction furnace further has a first gas outlet in communication with the first chamber, the flash reduction assembly further comprising:
the first discharger is communicated with the first discharge port and the second chamber, so that part of coarse particle pre-reduced spherical iron powder generated in the first chamber by the ultrapure iron concentrate can enter the second chamber through the first discharger;
the second discharger is communicated with the first air outlet and the second chamber, so that part of fine particle pre-reduced spherical iron powder generated in the first chamber by the ultrapure iron concentrate can enter the second chamber through the second discharger.
In some embodiments, the first outlet is located at the bottom of the flash reduction furnace and the first outlet is located above the first outlet.
In some embodiments, the flash reducing assembly further comprises a first separator positioned between and in communication with the second discharger and the flash reducing furnace, the first separator being configured to separate fine-grained pre-reduced spherical iron powder entrained in the first gas outlet exhaust gas.
In some embodiments, the flash recovery assembly further comprises a purifier in communication with the first separator and the composition regulator, the purifier for purifying gas flowing from the first separator into the composition regulator,
the composition regulator is communicated with the fluidized bed and is used for regulating CO and H in the gas flowing from the purifier into the composition regulator 2 And will CO and H 2 And the second chamber is communicated to meet the production requirement of the fluidized bed.
In some embodiments, the fluidized bed further has a second gas outlet in communication with the second chamber, the second discharge port being located at a bottom of the fluidized bed, the second gas outlet being located at a top of the fluidized bed, the fluidized bed assembly comprising:
the third discharger is communicated with the second chamber through the second discharge hole, the pre-reduced spherical iron powder in the second chamber and the reducing gas in the second chamber undergo secondary fine reduction reaction and generate high-metallization-rate spherical iron powder, and part of coarse-particle high-metallization-rate spherical iron powder in the second chamber is discharged into the third discharger through the second discharge hole for storage;
the fourth discharger is communicated with the second chamber through the second air outlet, and fine-particle high-metallization-rate spherical iron powder mixed in the exhaust gas of the second air outlet enters the fourth discharger.
In some embodiments, the fluidized bed assembly further comprises a second separator positioned between and in communication with the fourth discharger and the fluidized bed, the second separator being configured to separate fine-grained high metallization spherical iron powder entrained in gas within the second chamber.
In some embodiments, the fluidized bed assembly further comprises a discharge bin in communication with the third and fourth dischargers, the discharge bin for storing high metallization ratio spherical iron powder in the third and fourth dischargers.
In some embodiments, the apparatus for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate further comprises a pretreatment component, wherein the pretreatment component comprises a drying member, a screening member, a lifting member and a feeding member which are sequentially connected, the drying member is used for drying the ultrapure iron concentrate, the screening member is used for screening the ultrapure iron concentrate, the lifting member is used for lifting the ultrapure iron concentrate from the screening member to the feeding member, the feeding member is communicated with the feeding port, and the feeding member is used for introducing the ultrapure iron concentrate into the first chamber.
Drawings
Fig. 1 is a schematic view of an apparatus for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate according to an embodiment of the present utility model.
Reference numerals: 1. a flash restore assembly; 11. a flash reduction furnace; 111. a first chamber; 112. a first discharge port; 113. a first air outlet; 114. a feed inlet; 12. a first discharger; 13. a second discharger; 14. a first separator; 15. a purifier; 16. a composition adjuster; 2. a fluidized bed assembly; 21. a fluidized bed; 211. a second chamber; 212. a second discharge port; 213. a second air outlet; 22. a third discharger; 23. a fourth discharger; 24. a second separator; 25. discharging the material bin; 3. a pre-processing assembly; 31. a drying member; 32. a screening element; 33. a lifting member; 34. and a feeding member.
Detailed Description
Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
As shown in fig. 1, the apparatus for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate according to the embodiment of the present utility model includes a flash reduction assembly 1 and a fluidized bed assembly 2.
The flash reduction assembly 1 comprises a flash reduction furnace 11, the flash reduction furnace 11 is provided with a first chamber 111, a first discharge hole 112 and a feed hole 114, the first chamber 111 is communicated with the feed hole 114 and the first discharge hole 112, the first chamber 111 is internally provided with super-pure iron concentrate, reducing gas and oxygen-enriched air, and the reducing gas in the first chamber 111 comprises H 2 The ultra-pure iron concentrate undergoes a hydrogen flash reduction reaction in the first chamber 111 and produces pre-reduced spherical iron powder.
The fluidized bed assembly 2 comprises a fluidized bed 21, the fluidized bed 21 is provided with a second chamber 211 and a second discharge hole 212, the second chamber 211 is communicated with the second discharge hole 212 and the first discharge hole 112, the second chamber 211 is internally provided with a reducing gas, the pre-reduced spherical iron powder generated in the first chamber 111 can enter the second chamber 211 through the first discharge hole 112 and carry out secondary fine reduction reaction with the reducing gas in the second chamber 211 to generate spherical iron powder with high metallization rate, and the reducing gas in the second chamber 211 comprises CO and H 2 。
In the device for preparing spherical iron powder by hydrogen-based flash reduction of the ultra-pure iron concentrate, the ultra-pure iron concentrate is subjected to reduction reaction with the reducing gas in the first chamber 111 to generate pre-reduced spherical iron powder, and the reducing gas in the first chamber 111 is mainly H 2 The purity of the produced spherical iron powder is improved, and the pre-reduced spherical iron powder enters the second chamber 211 through the discharge hole and is communicated with CO and H in the second chamber 211 2 The secondary fine reduction reaction is carried out, and the metallization rate of the ultra-pure iron concentrate is improved, so that the device for preparing spherical iron powder by hydrogen-based flash reduction of the ultra-pure iron concentrate has less impurity and high purity, and can effectively reduce CO 2 And the environmental load is reduced. In addition, the device for preparing the spherical iron powder by hydrogen-based flash reduction of the ultra-pure iron concentrate is simple in structure and cost-saving.
In some embodiments, the feed port 114 of the flash reduction furnace 11 is located at the top of the flash reduction furnace 11 and communicates with the first chamber 111, and ultra-pure iron concentrate and reducing gas are injected into the first chamber 111 through the feed port 114.
Specifically, the reducing gas includes one or more of coke oven gas, converter gas, blast furnace gas, natural gas, liquefied gas, shale gas, biomass gas, hydrogen gas, and the like. Wherein the hydrogen content is more than 60%. The volume content of oxygen in the oxygen-enriched air is 50% -99.5%.
Specifically, the inside of the first chamber 111 of the flash reduction furnace 11 is divided into a preheating section, a reduction section, and a cooling section in this order from top to bottom. Wherein the reaction temperature of the reduction section is 1380-1600 ℃, and the temperature of the cooling section is less than 1000 ℃. In the process of falling in the first chamber 111, the ultrapure iron concentrate passes through a reduction section and undergoes flash reduction reaction in the reduction section, and then passes through a cooling section to rapidly reduce the temperature to below 1000 ℃ so as to obtain the pre-reduced spherical iron powder with the metallization rate of more than 85%.
Specifically, the temperature of the reducing gas in the second chamber 211 is 600 ℃ to 900 ℃, and the pre-reduced spherical iron powder entering the second chamber 211 from the first chamber 111 and the reducing gas undergo secondary fine reduction in the second chamber 211 to obtain the spherical iron powder with a high metallization rate of more than 99%.
Specifically, in the ultra-pure iron concentrate, the mass percentage of TFe is more than or equal to 70 percent.
In some embodiments, flash reducing furnace 11 also has a first gas outlet 113. The first air outlet 113 is communicated with the first chamber 111, the first discharge port 112 is positioned at the bottom of the flash reduction furnace 11, and the first air outlet 113 is positioned above the first discharge port 112.
The flash restoring assembly 1 further comprises a first tap 12 and a second tap 13. The first discharger 12 communicates with the first discharge port 112 and the second chamber 211 so that part of the coarse pre-reduced spherical fine iron produced in the first chamber 111 from the ultra-pure iron concentrate can enter the second chamber 211 through the first discharger 12. The second discharger 13 communicates with the second discharge port 113 and the second chamber 211 so that a portion of the fine-grained pre-reduced spherical fine iron produced in the first chamber 111 from the ultra-pure iron concentrate may enter the second chamber 211 through the second discharger 13.
Specifically, the mass of the fine-particle pre-reduced fine iron powder is smaller than that of the coarse-particle pre-reduced fine iron powder, and the first chamber 111 is further provided with a gas therein, so that the tail gas in the first chamber 111 carries the fine-particle pre-reduced fine iron powder from the second discharge port 113 into the second discharger 13 for storage.
In some embodiments, the flash reducing assembly 1 further comprises a first separator 14, the first separator 14 is located between the second discharger 13 and the flash reducing furnace 11 and is in communication with the second discharger 13 and the first air outlet 113, and the first separator 14 is used for separating fine-particle pre-reduced spherical iron powder entrained in the exhaust gas discharged from the first air outlet 113.
Specifically, the gas in the first chamber 111 carries the fine particulate pre-reduced fine spherical fine iron powder in the first chamber 111 from the first gas outlet 113 into the first separator 14, the first separator 14 separates the gas from the fine particulate pre-reduced fine spherical fine iron powder, and discharges the fine particulate pre-reduced spherical fine iron powder into the second discharger 13.
In some embodiments, flash recovery assembly 1 further includes a purifier 15 and a composition adjustor 16. The purifier 15 communicates with the first separator 14 and the component adjuster 16, and the purifier 15 is used to purify the gas flowing from the first separator 14 into the component adjuster 16.
Specifically, the purifier 15 is connected to the first separator 14 to purify the gas entering the purifier 15 from the first separator 14 to further separate the gas and the fine particle pre-reduced spherical fine iron, thereby further reducing the fine particle iron carried in the gas entering the composition regulator 16.
The component adjuster 16 is in communication with the fluidized bed 21, and the component adjuster 16 is configured to adjust the CO and H in the gas flowing from the purifier 15 into the component adjuster 16 2 And CO and H2 are passed into the second chamber 211 to meet the production requirements of the fluidised bed 21.
Specifically, the component adjuster 16 is for adjusting CO and H in the gas inside thereof 2 Is adjusted so that the content of CO+H 2 Is greater than 75%, CO and H 2 Introducing into the second chamber 211 to perform secondary fine reduction reaction with the pre-reduced spherical iron powder in the second chamber 211 to generate high metallizationAnd the spherical iron powder is obtained so as to recycle the tail gas in the first chamber 111.
In some embodiments, the fluidized bed 21 includes a second discharge port 212 and a second gas outlet port 213, the second discharge port 212 being located at the bottom of the fluidized bed 21 and the second gas outlet port 213 being located at the top of the fluidized bed 21.
The fluidized bed assembly 2 comprises a third discharger 22 and a fourth discharger 23. The third discharger 22 is communicated with the second chamber 211 through the second discharge hole 212, the pre-reduced spherical iron powder in the second chamber 211 and the reducing gas in the second chamber 211 perform secondary fine reduction reaction and generate spherical iron powder with high metallization rate, and part of coarse particle spherical iron powder with high metallization rate in the second chamber 211 is discharged into the third discharger 22 through the second discharge hole 212 for storage.
The fourth discharger 23 is communicated with the second chamber 211 through a second air outlet 213, and the fine-particle high-metallization-rate spherical iron powder generated in the second chamber 211 enters the fourth discharger 23 through the second air outlet 213 for storage. Specifically, the mass of the fine-particle high-metallization-rate spherical iron powder is smaller than that of the coarse-particle high-metallization-rate spherical iron powder, and the second chamber 211 is provided with gas therein, and the tail gas in the second chamber 211 carries the fine-particle spherical iron powder to rise from the bottom to the top of the second chamber 211 and enters the fourth discharger 23 from the second gas outlet 213 for storage.
In some embodiments, the fluidized bed assembly 2 further includes a second separator 24, the second separator 24 is located between the fourth discharger 23 and the fluidized bed 21 and is in communication with the fourth discharger 23 and the second chamber 211, and the second separator 24 is configured to separate fine-particle spherical iron powder with high metallization rate entrained in the tail gas in the second chamber 211.
Specifically, the tail gas in the second chamber 211 carries the fine-particle high-metallization-rate spherical iron powder in the second chamber 211 into the second separator 24, the second separator 24 separates the gas from the fine-particle high-metallization-rate spherical iron powder, and discharges the fine-particle high-metallization-rate spherical iron powder into the fourth discharger 23.
In some embodiments, the fluidized bed assembly 2 further includes a discharge bin 25, the discharge bin 25 being in communication with the third and fourth dischargers 22, 23, the discharge bin 25 being for storing high metallization ratio spherical iron powder in the third and fourth dischargers 22, 23.
In some embodiments, the apparatus for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate further comprises a pretreatment assembly 3, wherein the pretreatment assembly 3 comprises a drying member 31, a sieving member 32, a lifting member 33 and a feeding member 34 which are sequentially connected, the drying member 31 is used for drying the ultra-pure iron concentrate, the sieving member 32 is used for sieving the ultra-pure iron concentrate, the lifting member 33 is used for lifting the ultra-pure iron concentrate from the sieving member 32 to the feeding member 34, the feeding member 34 is communicated with the first chamber 111, and the feeding member 34 is used for introducing the ultra-pure iron concentrate into the first chamber 111.
Specifically, the drying piece 31 dries the ultra-pure iron ore concentrate until the moisture mass fraction in the ore powder is lower than 1%, then the ultra-pure iron ore concentrate is introduced into the screening piece 32, and the screening piece 32 screens the ultra-pure iron ore concentrate and screens the ultra-pure iron ore concentrate into ore powder with the particle size of 20-40 μm.
In some embodiments, a method for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate comprises:
firstly, carrying out pretreatment on the ultra-pure iron concentrate.
Specifically, the ultra-pure iron ore concentrate is dried through the drying piece 31 until the mass fraction of water in the ultra-pure iron ore concentrate is lower than 1%. And then the dried ultra-pure iron ore concentrate is led into a screening piece 32, and the ultra-pure iron ore concentrate is screened by the screening piece 32 to obtain the ultra-pure iron ore concentrate with the particle size smaller than 100 mu m. The ultra-pure iron ore concentrate is lifted into the feeding member 34 by the lifting member 33 to be stored, and the feeding member 34 is communicated with the feeding port 114, so that the ore powder can be sprayed into the first chamber 111 through the feeding port 114. Wherein the mass percentage of TFe in the ultra-pure iron concentrate is more than or equal to 70 percent.
And secondly, carrying out rapid reduction reaction on the ultrapure iron concentrate.
Specifically, the ultra-pure iron concentrate is thrown into the first chamber 111 of the flash reduction furnace 11 through the feed port 114, reducing gas and oxygen-enriched air are injected into the first chamber 111, the ultra-pure iron concentrate is preheated in the first chamber 111 through the preheating section, then undergoes flash reduction through the reduction section to generate spherical molten drops, and then the spherical molten drops drop down and rapidly cooled and solidified through the cooling zone to form pre-reduced spherical iron powder.
After the rapid reduction reaction of the ultra-pure iron concentrate is completed, coarse-particle pre-reduced spherical iron powder generated in the first chamber 111 is stored in the first discharger 12 through the first discharge port 112, and the reduction tail gas in the first chamber 111 enters the first separator 14 through the first discharge port 113 to be separated, and fine-particle pre-reduced spherical iron powder carried in the tail gas is separated into the second discharger 13.
Wherein the reduction temperature of the ultrapure iron ore concentrate in the reduction section is 1380-1600 ℃, the reduction time is 1-10 s, and the cooling temperature of the spherical molten drops in the cooling area is less than 1000 ℃.
Wherein the reducing gas in the first chamber 111 comprises H 2 ，H 2 The content is more than 60 percent, the possibility of carburization in the process of reducing the ultra-pure iron concentrate can be effectively reduced, and the purity of the generated spherical iron powder is improved. The metallization rate of the ultra-pure iron ore concentrate is more than 85 percent.
Specifically, in the flash reduction process, the reduction time of the ultrapure iron concentrate powder can be adjusted by adjusting the gas velocity of the reducing gas, the metallization rate of the reduced ultrapure iron concentrate powder can be adjusted by adjusting the reduction temperature and the reducing atmosphere, and in order to maintain the reduction temperature, a proper amount of preheated oxygen-enriched air can be introduced into the first chamber 111 to enable the combustible gas to burn and release heat.
Thirdly, pre-reducing the spherical iron powder to perform secondary fine reduction reaction.
The pre-reduced fine spherical fine iron in the first and second discharger 12 and 13 is discharged into the second chamber 211 of the fluidized bed 21, and the reducing gas is injected into the second chamber 211, and the pre-reduced fine spherical fine iron is subjected to secondary fine reduction in the second chamber 211.
After the secondary fine reduction reaction is completed, the coarse-particle high-metallization-rate spherical iron powder generated in the second chamber 211 enters the third discharger 22 through the second discharge hole 212 to be stored, the reduction tail gas in the second chamber 211 enters the second separator 24 through the second gas outlet 213 to be separated, the fine-particle high-metallization-rate spherical iron powder carried in the tail gas is separated to the fourth discharger 23 to be stored, and then the coarse-particle high-metallization-rate spherical iron powder and the fine-particle high-metallization-rate spherical powder are discharged into the discharge bin 25.
Wherein the reduction temperature in the second chamber 211 is 600-900 ℃, and the reaction time is 10-60 min.
The reducing gas in the second chamber 211 includes CO+H 2 And CO+H 2 The content is more than 75 percent, the purity of the spherical iron powder can be further improved, the metallization rate of the ultra-pure iron concentrate is improved, and the CO is reduced 2 And the environmental load is reduced. The metallization rate of the ultra-pure iron ore concentrate is more than 99 percent.
Specifically, the gas in the second chamber 211 may be purified and adjusted, and then introduced into the second chamber 211 to be used as a reducing gas, so as to realize recycling of the tail gas.
The principle of the method for preparing spherical iron powder by hydrogen-based flash reduction of the ultra-pure iron concentrate in the embodiment of the utility model is as follows: because the particle size of the ultra-pure iron concentrate is smaller than 100 mu m, and in the rapid reduction process, the ultra-pure iron concentrate is reduced in a suspension state in the first chamber 111, so that the heat and mass transfer process between the ultra-pure iron concentrate and gas is enhanced, and the reduction reaction can be completed within 1-10 s. And the flash reduction temperature in the first chamber 111 ranges from 1380 to 1600 deg.c, so that the intermediate FeO generated during the rapid reduction process is melted and naturally shrunk into a sphere in the temperature range, thereby facilitating further reduction to obtain spherical metallic iron powder. And then the pre-reduced spherical iron powder in the first chamber 111 is sent into the second chamber 211, and high-temperature reducing gas is introduced into the second chamber 211 to carry out secondary fine reduction on the pre-reduced spherical iron powder, so as to obtain the high-metallization-rate spherical iron powder with the metallization rate of more than 99%.
Therefore, the method for preparing the spherical iron powder by hydrogen-based flash reduction of the ultrapure iron concentrate is simple in process and cost-saving.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.
Claims (10)
1. The device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate is characterized by comprising:
flash reduction assembly (1), flash reduction assembly (1) includes flash reduction furnace (11), flash reduction furnace (11) have first cavity (111), first discharge gate (112) and feed inlet (114), first cavity (111) with feed inlet (114) with first discharge gate (112) intercommunication each other, have ultrapure iron ore concentrate and reducing gas and oxygen boosting air in first cavity (111), the reducing gas in first cavity (111) includes H 2 The ultrapure iron concentrate undergoes a hydrogen flash reduction reaction in the first chamber (111) and produces pre-reduced spherical iron powder;
a fluidized bed assembly (2), the fluidized bed assembly (2) comprising a fluidized bed (21), the fluidized bed (21) having a second chamber (211) and a second discharge opening (212), the firstThe second chamber (211) is communicated with the second discharge hole (212) and the first discharge hole (112), the second chamber (211) is internally provided with reducing gas, the pre-reduced spherical iron powder generated in the first chamber (111) can enter the second chamber (211) through the first discharge hole (112) and perform secondary fine reduction reaction with the reducing gas in the second chamber (211) to generate spherical iron powder with high metallization rate, and the reducing gas in the second chamber (211) comprises CO and H 2 。
2. The device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate according to claim 1, wherein the first chamber (111) comprises a preheating section, a reduction section and a cooling section which are sequentially arranged from top to bottom, the ultrapure iron concentrate sequentially passes through the preheating section, the reduction section and the cooling section, the temperature of the reduction section is 1380-1600 ℃, and the temperature of the cooling section is less than 1000 ℃.
3. The apparatus for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate according to claim 1, wherein the flash reduction furnace (11) further has a first air outlet (113), the first air outlet (113) is in communication with the first chamber (111), and the flash reduction assembly (1) further comprises:
the first discharger (12) is communicated with the first discharge hole (112) and the second chamber (211) so that part of coarse particle pre-reduced spherical iron powder generated by the ultra-pure iron concentrate in the first chamber (111) can enter the second chamber (211) through the first discharger (12);
the second discharger (13) is communicated with the first air outlet (113) and the second chamber (211), so that part of fine-particle pre-reduced spherical iron powder generated in the first chamber (111) by the ultra-pure iron concentrate can enter the second chamber (211) through the second discharger (13).
4. A device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate according to claim 3, characterized in that the first discharge port (112) is positioned at the bottom of the flash reduction furnace (11), and the first gas outlet (113) is positioned above the first discharge port (112).
5. A device for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate according to claim 3, characterized in that the flash reduction assembly (1) further comprises a first separator (14), the first separator (14) is located between the second discharger (13) and the flash reduction furnace (11) and is communicated with the second discharger (13) and the first air outlet (113), and the first separator (14) is used for separating fine particle pre-reduced spherical iron powder mixed in the exhaust gas of the first air outlet (113).
6. The apparatus for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate according to claim 5, wherein the flash reduction assembly (1) further comprises a purifier (15) and a composition regulator (16), the purifier (15) being in communication with the first separator (14) and the composition regulator (16), the purifier (15) being for purifying gas flowing from the first separator (14) into the composition regulator (16),
the component adjuster (16) is communicated with the fluidized bed (21), and the component adjuster (16) is used for adjusting CO and H in the gas flowing from the purifier (15) into the component adjuster (16) 2 And will CO and H 2 And into the second chamber (211) to meet the production requirements of the fluidized bed (21).
7. A device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate according to claim 3, characterized in that the fluidized bed (21) further has a second air outlet (213), the second air outlet (213) being in communication with the second chamber (211), the second air outlet (212) being located at the bottom of the fluidized bed (21), the second air outlet (213) being located at the top of the fluidized bed (21), the fluidized bed assembly (2) comprising:
the third discharger (22) is communicated with the second chamber (211) through the second discharge hole (212), the pre-reduced spherical iron powder in the second chamber (211) and the reducing gas in the second chamber (211) undergo secondary fine reduction reaction and generate spherical iron powder with high metallization rate, and part of coarse particle spherical iron powder with high metallization rate in the second chamber (211) is discharged into the third discharger (22) through the second discharge hole (212) for storage;
the fourth discharger (23), the fourth discharger (23) is communicated with the second chamber (211) through the second air outlet (213), and fine particle high metallization rate spherical iron powder mixed in the exhaust gas of the second air outlet (213) enters the fourth discharger (23).
8. The apparatus for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate according to claim 7, wherein the fluidized bed assembly (2) further comprises a second separator (24), the second separator (24) is located between the fourth discharger (23) and the fluidized bed (21) and communicates the fourth discharger (23) and the second chamber (211), and the second separator (24) is used for separating fine-particle high metallization ratio spherical iron powder mixed in gas in the second chamber (211).
9. The device for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate according to claim 8, wherein the fluidized bed assembly (2) further comprises a discharge bin (25), the discharge bin (25) is communicated with the third discharger (22) and the fourth discharger (23), and the discharge bin (25) is used for storing high metallization rate spherical iron powder in the third discharger (22) and the fourth discharger (23).
10. The device for preparing spherical iron powder by hydrogen-based flash reduction of ultra-pure iron concentrate according to claim 1, further comprising a pretreatment component (3), wherein the pretreatment component (3) comprises a drying member (31), a sieving member (32), a lifting member (33) and a feeding member (34) which are sequentially connected, the drying member (31) is used for drying the ultra-pure iron concentrate, the sieving member (32) is used for sieving the ultra-pure iron concentrate, the lifting member (33) is used for lifting the ultra-pure iron concentrate from the sieving member (32) to the feeding member (34), the feeding member (34) is communicated with the feeding port (114), and the feeding member (34) is used for leading the ultra-pure iron concentrate into the first chamber (111).
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| CN202320680335.7U CN219924552U (en) | 2023-03-30 | 2023-03-30 | Device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate |
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| CN202320680335.7U CN219924552U (en) | 2023-03-30 | 2023-03-30 | Device for preparing spherical iron powder by hydrogen-based flash reduction of ultrapure iron concentrate |
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